My maps are all red? Orange? Purple?

For a RED map:

This is caused by the Terrain Overlay.  In Plan Mode, your map will be tinted to show terrain based on your highest planned cruise altitude (if you haven’t set an altitude, everything will be tinted red).  In Fly Mode, the map is tinted according to your current GPS altitude.  Terrain within 1500′ to 500′ will be tinted yellow, whereas terrain 501′ to above will be tinted red.

• Tap En Route to view your map.
• Tap the Map Settings button (two gears icon, top right corner of screen)
• Un-tick Terrain Overlay
• Your map should return to normal

An example of the Terrain Overlay in action while set to Plan mode and a cruise height selected in the flight plan.

For an Orange/Blue/Purple map:

This is caused by a SIGMET that is current over your viewing area that may have not been active the last time you viewed it.

• Tap En Route to view your map.
• Tap the Weather Overlays button (RADAR icon, near the top right corner of screen)
• Un-tick SIGMETs
• Your map should return to normal

Above is an example of AIRMETs and Severe Turbulence SIGMETs over USA, below is an example of Severe Icing and Severe Turbulence SIGMETs over Australia.